Revert of Removed virtualenv from depot_tools

bootstrap/virtualenv/virtualenv_embedded/activate.ps1

Index: bootstrap/virtualenv/virtualenv_embedded/activate.ps1
diff --git a/bootstrap/virtualenv/virtualenv_embedded/activate.ps1 b/bootstrap/virtualenv/virtualenv_embedded/activate.ps1
new file mode 100644
index 0000000000000000000000000000000000000000..0f4adf19f81c80c7b6a919a8bb6bc2b66f993b33
--- /dev/null
+++ b/bootstrap/virtualenv/virtualenv_embedded/activate.ps1
@@ -0,0 +1,150 @@
+# This file must be dot sourced from PoSh; you cannot run it
+# directly. Do this: . ./activate.ps1
+
+# FIXME: clean up unused vars.
+$script:THIS_PATH = $myinvocation.mycommand.path
+$script:BASE_DIR = split-path (resolve-path "$THIS_PATH/..") -Parent
+$script:DIR_NAME = split-path $BASE_DIR -Leaf
+
+function global:deactivate ( [switch] $NonDestructive ){
+
+    if ( test-path variable:_OLD_VIRTUAL_PATH ) {
+        $env:PATH = $variable:_OLD_VIRTUAL_PATH
+        remove-variable "_OLD_VIRTUAL_PATH" -scope global
+    }
+
+    if ( test-path function:_old_virtual_prompt ) {
+        $function:prompt = $function:_old_virtual_prompt
+        remove-item function:\_old_virtual_prompt
+    }
+
+    if ($env:VIRTUAL_ENV) {
+        $old_env = split-path $env:VIRTUAL_ENV -leaf
+        remove-item env:VIRTUAL_ENV -erroraction silentlycontinue
+    }
+
+    if ( !$NonDestructive ) {
+        # Self destruct!
+        remove-item function:deactivate
+    }
+}
+
+# unset irrelevant variables
+deactivate -nondestructive
+
+$VIRTUAL_ENV = $BASE_DIR
+$env:VIRTUAL_ENV = $VIRTUAL_ENV
+
+$global:_OLD_VIRTUAL_PATH = $env:PATH
+$env:PATH = "$env:VIRTUAL_ENV/Scripts;" + $env:PATH
+if (! $env:VIRTUAL_ENV_DISABLE_PROMPT) {
+    function global:_old_virtual_prompt { "" }
+    $function:_old_virtual_prompt = $function:prompt
+    function global:prompt {
+        # Add a prefix to the current prompt, but don't discard it.
+        write-host "($(split-path $env:VIRTUAL_ENV -leaf)) " -nonewline
+        & $function:_old_virtual_prompt
+    }
+}
+
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